That is not mistake too, because some of them will get their money back after playing couple of time. But most of them sure take some loss too but it still worth to try when you have some spare money. But never gambling what you can't afford to lose and never greedy, this will just make you worst
Yeah that is addiction but if you can control it I think it is ok. Lets say if he win I think he will start to withdraw some of their money before start to gamble again. If you lose you just can try again next time, if it does not interfere your financial in real life I think it is ok for you to keep on coming back and keep trying, one day you will earn back what you lose before